globalSetup file must export a function

[janmeier]

I'm trying to switch out ts-jest with esbuild-jest, but I'm running into this error:

TypeError: globalSetup file must export a function at .../src/__tests__/globalSetup.ts

With the following jest config

module.exports = {
  projects: [{ 
    transform: {
      '.(ts|tsx)': 'esbuild-jest',
    },
    testPathIgnorePatterns: ['<rootDir>/dist/', '<rootDir>/node_modules/'],
    ...
  }],
  globalSetup: './/src/__tests__/globalSetup.ts',
}

I've dug up some old issues both in jest and ts-jest, but I haven't found the root cause of this kulshekhar/ts-jest#411, jestjs/jest#5164.

Deps:

"jest": "^26.5.3",
"esbuild-jest": "^0.2.2",

[aelbore]

@janmeier can you try the esbuild-jest@0.3.0 with esbuild@latest let me know if you still encounter the issue.

[janmeier]

Hi Jay

Unfortunately we were stumped by another issue that's preventing us from using esbuild with jest. The way that esbuild exports modules makes them impossible to stub, so we are going withrthe regular tsc for our tests for now. Thanks for taking the time to look into this issue though